Error Loading OS PLEASE HELP!!

So I did some cable clean up in my case today. Everything is connected just as before, and yes I'm sure. When I boot the computer. The Raid Array shows as healthy but I get an error message that says "Error Loading OS" I have no idea what to do please help me out. system is in the sig.

ok it ended up being some off-the-wall bios setting. *huge gigantic enourmous sigh of relief*

Right.
Must we beg?

What "off-the-wall" BIOS setting was it?